In this open inquiry activity introducing concepts of remote sensing, students will discuss and research different invisible phenomena. They will then test and verify the existence of selected invisible phenomena by using measurement or detection...(View More) devices. Depending on the phenomena being investigated, some of the following supplies are suggested: thermometer, light meter, decibel meter, telescope, gas sensors, filters, anemometer, and/or radon testing kit. This activity is part of the Ground Truth Studies Teacher Handbook, which provides more than 20 activities to build student understanding of global change and remote sensing, and includes background chapters for teachers, glossary, and appendices.(View Less)